State Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou 310027, P. R. China.
Nanoscale. 2011 Sep 1;3(9):3915-22. doi: 10.1039/c1nr10737b. Epub 2011 Aug 17.
The synthesis and clarifications in structure-property relationship for anatase TiO(2) crystals exposing (001) facets have attracted much attention. In this paper, a novel titania microsphere with nearly all-(001) surface was synthesized by hydrothermal treatment of a thermal sprayed TiN/Ti coating with HF aqueous solution containing chromium powders. Unlike the conventional (001)-facet exposed anatase crystals, which are highly truncated bipyramids, the crystal achieved in the current investigation is drum-like with a round cross section. The formation of the drum-like crystals was contributed to a balance between the erosion and precipitation of anatase single crystallites. The Cr-doping in anatase was believed to increase the surface deficiency which enhanced the erosion procedure, leading to the drum-like crystals. The XPS analysis confirmed the incorporations of N, F and Cr in the microsized anatase crystals through the one-pot reaction, which led to a significantly enhanced solar absorption. The UV-Vis diffuse reflectance revealed a band-to-band red-shift of the band gap of the anatase crystals to 1.60 eV, which is contributed mainly to the homogeneous Cr-doping.
具有（001）面暴露的锐钛矿 TiO(2) 晶体的合成和结构-性能关系的阐明引起了广泛关注。本文通过 HF 水溶液中添加铬粉对热喷涂 TiN/Ti 涂层进行水热处理，合成了一种具有几乎全部（001）表面的新型锐钛矿微球。与传统的（001）面暴露的锐钛矿晶体（高度截顶的双锥体形）不同，当前研究中获得的晶体呈鼓状，具有圆形横截面。鼓状晶体的形成归因于锐钛矿单晶的侵蚀和沉淀之间的平衡。人们认为，Cr 的掺杂会增加表面缺陷，从而增强侵蚀过程，导致形成鼓状晶体。XPS 分析通过一锅反应证实了 N、F 和 Cr 掺入微尺寸锐钛矿晶体中，从而显著提高了对太阳光的吸收。UV-Vis 漫反射表明锐钛矿晶体的带隙发生了带-带蓝移至 1.60 eV，这主要归因于均匀的 Cr 掺杂。
